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When constant folding GEP expressions, keep the address space information of pointers.
Together with Ran Chachick <ran.chachick@intel.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160954 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -603,6 +603,22 @@ static Constant *CastGEPIndices(ArrayRef<Constant *> Ops,
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return C;
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}
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/// Strip the pointer casts, but preserve the address space information.
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static Constant* StripPtrCastKeepAS(Constant* Ptr) {
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assert(Ptr->getType()->isPointerTy() && "Not a pointer type");
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PointerType *OldPtrTy = cast<PointerType>(Ptr->getType());
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Ptr = cast<Constant>(Ptr->stripPointerCasts());
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PointerType *NewPtrTy = cast<PointerType>(Ptr->getType());
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// Preserve the address space number of the pointer.
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if (NewPtrTy->getAddressSpace() != OldPtrTy->getAddressSpace()) {
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NewPtrTy = NewPtrTy->getElementType()->getPointerTo(
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OldPtrTy->getAddressSpace());
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Ptr = ConstantExpr::getBitCast(Ptr, NewPtrTy);
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}
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return Ptr;
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}
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/// SymbolicallyEvaluateGEP - If we can symbolically evaluate the specified GEP
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/// constant expression, do so.
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static Constant *SymbolicallyEvaluateGEP(ArrayRef<Constant *> Ops,
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@ -645,7 +661,7 @@ static Constant *SymbolicallyEvaluateGEP(ArrayRef<Constant *> Ops,
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APInt(BitWidth, TD->getIndexedOffset(Ptr->getType(),
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makeArrayRef((Value **)Ops.data() + 1,
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Ops.size() - 1)));
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Ptr = cast<Constant>(Ptr->stripPointerCasts());
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Ptr = StripPtrCastKeepAS(Ptr);
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// If this is a GEP of a GEP, fold it all into a single GEP.
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while (GEPOperator *GEP = dyn_cast<GEPOperator>(Ptr)) {
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@ -664,7 +680,7 @@ static Constant *SymbolicallyEvaluateGEP(ArrayRef<Constant *> Ops,
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Ptr = cast<Constant>(GEP->getOperand(0));
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Offset += APInt(BitWidth,
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TD->getIndexedOffset(Ptr->getType(), NestedOps));
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Ptr = cast<Constant>(Ptr->stripPointerCasts());
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Ptr = StripPtrCastKeepAS(Ptr);
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}
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// If the base value for this address is a literal integer value, fold the
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10
test/Transforms/InstCombine/2012-07-30-addrsp-bitcast.ll
Normal file
10
test/Transforms/InstCombine/2012-07-30-addrsp-bitcast.ll
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@ -0,0 +1,10 @@
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK: bitcast
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@base = internal addrspace(3) unnamed_addr global [16 x i32] zeroinitializer, align 16
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declare void @foo(i32*)
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define void @test() nounwind {
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call void @foo(i32* getelementptr (i32* bitcast ([16 x i32] addrspace(3)* @base to i32*), i64 2147483647)) nounwind
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ret void
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}
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